Hybrid Filtering of Emails

It is used in the open source programs Spam Assassin and Policyd-weight uses some or all of the various tests for spam, and assigns a numerical score to each test. Each received message is scanned for these patterns and the applicable scores tallied up. If the resulting total is above a fixed value, then the message is rejected as spam or else it is allowed to go through. Since multiple tests are used to analyze each message, the probability that a legitimate message be flagged as spam is very low.